Screenshots und Beispiele 30.10.2024

20241030/fehler.txt

+cat: gibtsnicht.txt: Datei oder Verzeichnis nicht gefunden

20241030/find-01.txt

+cassini/home/peter/bo/2024ws/dbs> find . -name "dbs-2024*.tex"
+./20241002/dbs-2024ws-p0.tex
+./20241002/dbs-20241002.tex
+./20241030/dbs-2024ws-p1.tex
+./20241030/dbs-20241030.tex
+./20241016/dbs-20241016.tex
+./20241009/dbs-20241009.tex
+cassini/home/peter/bo/2024ws/dbs> grep "Sägefisch" $(find . -name "dbs-2024*.tex")
+./20241030/dbs-20241030.tex:    $ ¡grep -l "Sägefisch" $(find . -name "dbs-2024*.tex")¿
+cassini/home/peter/bo/2024ws/dbs> find . -name "dbs-2024*.tex" | xargs grep "Sägefisch"
+./20241030/dbs-20241030.tex:    $ ¡grep -l "Sägefisch" $(find . -name "dbs-2024*.tex")¿
+cassini/home/peter/bo/2024ws/dbs> find . -name "dbs-2024*.tex" -exec grep "Sägefisch" {} +
+./20241030/dbs-20241030.tex:    $ ¡grep -l "Sägefisch" $(find . -name "dbs-2024*.tex")¿
+cassini/home/peter/bo/2024ws/dbs> find . -name "dbs-2024*.tex" -exec grep "Sägefisch" {} \;
+    $ ¡grep -l "Sägefisch" $(find . -name "dbs-2024*.tex")¿
+cassini/home/peter/bo/2024ws/dbs>

20241030/find-02.txt

+cassini/home/peter/bo/2024ws/dbs> grep "Sägefisch" $(find . -name "dbs-2024*.tex")
+./20241030/dbs-20241030.tex:    $ ¡grep -l "Sägefisch" $(find . -name "dbs-2024*.tex")¿
+cassini/home/peter/bo/2024ws/dbs> grep -l "Sägefisch" $(find . -name "dbs-2024*.tex")
+./20241030/dbs-20241030.tex
+cassini/home/peter/bo/2024ws/dbs> vi $(grep -l "Sägefisch" $(find . -name "dbs-2024*.tex"))

20241030/if-01.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> if grep Blubb *.tex; then echo "gefunden"; else echo "nicht gefunden"; fi
+dbs-20241030.tex:    $ ¡if grep Blubb test.txt; then echo "gefunden"; \
+gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030> if grep "Sägefisch" *.tex; then echo "gefunden"; else echo "nicht gefunden"; fi
+dbs-20241030.tex:    $ ¡grep -l "Sägefisch" $(find . -name "dbs-2024*.tex")¿
+gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030> if grep -q "Sägefisch" *.tex; then echo "gefunden"; else echo "nicht gefunden"; fi
+gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030> if grep "Sägefisch" *.tex > /dev/null; then echo "gefunden"; else echo "nicht gefunden"; fi
+gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030> if grep "Hammerhai" *.tex > /dev/null; then echo "gefunden"; else echo "nicht gefunden"; fi
+nicht gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/io-streams-01.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> cat gibtsnicht.txt
+cat: gibtsnicht.txt: Datei oder Verzeichnis nicht gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030> cat gibtsnicht.txt > fehler.txt
+cat: gibtsnicht.txt: Datei oder Verzeichnis nicht gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030> cat fehler.txt
+cassini/home/peter/bo/2024ws/dbs/20241030> cat gibtsnicht.txt 2> fehler.txt
+cassini/home/peter/bo/2024ws/dbs/20241030> cat fehler.txt
+cat: gibtsnicht.txt: Datei oder Verzeichnis nicht gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030> cat gibtsnicht.txt > fehler.txt 2>&1
+cassini/home/peter/bo/2024ws/dbs/20241030> cat fehler.txt
+cat: gibtsnicht.txt: Datei oder Verzeichnis nicht gefunden
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/pipes-01.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> echo "2 + 2" | bc
+4
+cassini/home/peter/bo/2024ws/dbs/20241030> echo "2 + 2" | gzip
+gzip: compressed data not written to a terminal. Use -f to force compression.
+For help, type: gzip -h
+cassini/home/peter/bo/2024ws/dbs/20241030> echo "2 + 2" | gzip -f
+3R�V0���j{cassini/home/peter/bo/2024ws/dbs/20241030> echo "2 + 2" | gzip | gunzip
+2 + 2
+cassini/home/peter/bo/2024ws/dbs/20241030> echo "2 + 2" | gzip | gunzip | bc
+4
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/pipes-02.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> echo "2 + 2" | gzip | cat | gunzip | bc
+4
+cassini/home/peter/bo/2024ws/dbs/20241030> echo "2 + 2" | gzip | cat | gunzip | cat | bc
+4
+cassini/home/peter/bo/2024ws/dbs/20241030> cat /proc/sys/fs/file-max
+9223372036854775807
+cassini/home/peter/bo/2024ws/dbs/20241030> echo "obase=16" | bc
+cassini/home/peter/bo/2024ws/dbs/20241030> (echo "obase=16"; cat /proc/sys/fs/file-max) | bc 7FFFFFFFFFFFFFFF
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/rename.sh

+c=1
+chmod -x *.JPG
+for x in DSC_[0-9][0-9][0-9][0-9].JPG; do
+  y=$(printf "%04d" $c).jpg
+  mv $x $y
+  c=$((c + 1))
+done

20241030/sed-01.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> echo "Dies ist ein Test." > test.txt
+cassini/home/peter/bo/2024ws/dbs/20241030> sed -i test.txt -e 's/Test/Toast/'
+cassini/home/peter/bo/2024ws/dbs/20241030> cat test.txt
+Dies ist ein Toast.
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/seq-01.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> seq
+seq: fehlender Operand
+„seq --help“ liefert weitere Informationen.
+cassini/home/peter/bo/2024ws/dbs/20241030> seq 10
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+cassini/home/peter/bo/2024ws/dbs/20241030> seq 10 0
+cassini/home/peter/bo/2024ws/dbs/20241030> seq 10 -1 0
+10
+9
+8
+7
+6
+5
+4
+3
+2
+1
+0
+cassini/home/peter/bo/2024ws/dbs/20241030> for x in $(seq 10); do echo "Hallo! :-)"; done
+Hallo! :-)
+Hallo! :-)
+Hallo! :-)
+Hallo! :-)
+Hallo! :-)
+Hallo! :-)
+Hallo! :-)
+Hallo! :-)
+Hallo! :-)
+Hallo! :-)
+cassini/home/peter/bo/2024ws/dbs/20241030> for x in $(seq 10); do echo "Hallo! :-) $x"; done
+Hallo! :-) 1
+Hallo! :-) 2
+Hallo! :-) 3
+Hallo! :-) 4
+Hallo! :-) 5
+Hallo! :-) 6
+Hallo! :-) 7
+Hallo! :-) 8
+Hallo! :-) 9
+Hallo! :-) 10
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/tcp-ip-01.txt

+cassini/root# ifconfig
+lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
+        inet 127.0.0.1  netmask 255.0.0.0
+        inet6 ::1  prefixlen 128  scopeid 0x10<host>
+        loop  txqueuelen 1000  (Lokale Schleife)
+        RX packets 2297761  bytes 6115607912 (5.6 GiB)
+        RX errors 0  dropped 0  overruns 0  frame 0
+        TX packets 2297761  bytes 6115607912 (5.6 GiB)
+        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
+
+wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
+        inet 10.128.29.182  netmask 255.255.255.0  broadcast 10.128.29.255
+        inet6 fe80::c685:8ff:fe4a:5042  prefixlen 64  scopeid 0x20<link>
+        ether c4:85:08:4a:50:42  txqueuelen 1000  (Ethernet)
+        RX packets 359517  bytes 120220340 (114.6 MiB)
+        RX errors 0  dropped 0  overruns 0  frame 0
+        TX packets 629790  bytes 335544446 (320.0 MiB)
+        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
+
+cassini/root# ip neighbour
+10.128.29.1 dev wlan0 lladdr 00:1b:17:00:01:18 REACHABLE
+cassini/root# ip addr
+1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
+    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
+    inet 127.0.0.1/8 scope host lo
+       valid_lft forever preferred_lft forever
+    inet6 ::1/128 scope host noprefixroute
+       valid_lft forever preferred_lft forever
+2: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
+    link/ether c4:85:08:4a:50:42 brd ff:ff:ff:ff:ff:ff
+    altname wlp2s0
+    inet 10.128.29.182/24 brd 10.128.29.255 scope global dynamic wlan0
+       valid_lft 600875sec preferred_lft 600875sec
+    inet6 fe80::c685:8ff:fe4a:5042/64 scope link
+       valid_lft forever preferred_lft forever
+cassini/root# ping 10.128.29.1
+PING 10.128.29.1 (10.128.29.1) 56(84) bytes of data.
+64 bytes from 10.128.29.1: icmp_seq=1 ttl=64 time=1.82 ms
+64 bytes from 10.128.29.1: icmp_seq=2 ttl=64 time=2.05 ms
+64 bytes from 10.128.29.1: icmp_seq=3 ttl=64 time=1.73 ms
+^C
+--- 10.128.29.1 ping statistics ---
+3 packets transmitted, 3 received, 0% packet loss, time 2003ms
+rtt min/avg/max/mdev = 1.729/1.866/2.049/0.134 ms
+cassini/root#

20241030/tcp-ip-02.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> ping 88.198.170.60
+PING 88.198.170.60 (88.198.170.60) 56(84) bytes of data.
+64 bytes from 88.198.170.60: icmp_seq=1 ttl=55 time=12.9 ms
+64 bytes from 88.198.170.60: icmp_seq=2 ttl=55 time=12.7 ms
+64 bytes from 88.198.170.60: icmp_seq=3 ttl=55 time=12.7 ms
+^C
+--- 88.198.170.60 ping statistics ---
+3 packets transmitted, 3 received, 0% packet loss, time 2003ms
+rtt min/avg/max/mdev = 12.689/12.772/12.936/0.115 ms
+cassini/home/peter/bo/2024ws/dbs/20241030> nc 88.198.170.60 80
+Hallo?
+HTTP/1.1 400 Bad Request
+Date: Wed, 30 Oct 2024 11:38:18 GMT
+Server: Apache/2.4.62 (Debian)
+Content-Length: 308
+Connection: close
+Content-Type: text/html; charset=iso-8859-1
+
+<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
+<html><head>
+<title>400 Bad Request</title>
+</head><body>
+<h1>Bad Request</h1>
+<p>Your browser sent a request that this server could not understand.<br />
+</p>
+<hr>
+<address>Apache/2.4.62 (Debian) Server at m31.gerwinski.de Port 80</address>
+</body></html>
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/tcp-ip-03.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> nc 88.198.170.60 81
+(UNKNOWN) [88.198.170.60] 81 (?) : Connection refused
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/tcp-ip-03a.txt

+cassini/home/peter> nc -p 1234 -l
+Hallo?
+Selber Hallo!
+???
+!!!
+^C
+cassini/home/peter>

20241030/tcp-ip-04.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> nc 88.198.170.60 81
+(UNKNOWN) [88.198.170.60] 81 (?) : Connection refused
+cassini/home/peter/bo/2024ws/dbs/20241030> cat >> tcp-ip-03.txt
+cassini/home/peter/bo/2024ws/dbs/20241030> nc 88.198.170.60 81
+(UNKNOWN) [88.198.170.60] 81 (?) : Connection refused
+cassini/home/peter/bo/2024ws/dbs/20241030>
+cassini/home/peter/bo/2024ws/dbs/20241030> nc 127.0.0.1 1234
+Hallo?
+Selber Hallo!
+???
+!!!
+cassini/home/peter/bo/2024ws/dbs/20241030>
+cassini/home/peter/bo/2024ws/dbs/20241030> nc 88.198.170.60 80
+GET /^M
+<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html>
+ <head>
+  <title>ngc224.gerwinski.de</title>
+ </head>
+ <body background="ngc224.jpg" bgcolor="#000000" text="#CFCFCF"
+       link="#7F7FFF" alink="#CFCFFF" vlink="#FF5FFF">
+  <h1>ngc224.gerwinski.de - der Server</h1>
+  <p>Benannt nach der Andromeda-Galaxie - M31 - NGC224
+  <p align="center"><img src="null.png" alt="" width="1" height="1" vspace="360">
+  <p><font size="-2"><a href="http://www.peter.gerwinski.de">Peter Gerwinski</a><br>
+  <a href="http://www.noao.edu/image_gallery/html/im0424.html">Bild:
+  Bill Schoening, Vanessa Harvey/REU program/NOAO/AURA/NSF</a></font>
+ </body>
+</html>
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/tcp-ip-05.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> nc localhost 1234
+2 + 2
+4
+2 ^ 64
+18446744073709551616
+obase=16
+65535
+FFFF
+quit
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/tcp-ip-05a.txt

+cassini/home/peter> nc -p 1234 -l -c bc
+cassini/home/peter>

20241030/test.txt

+Dies ist ein Toast.